ExecutionEngine.cpp revision 7c2b7c7c75a3549b2d6933edf3110294a33ff2d4
1//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the common interface used by the various execution engine 11// subclasses. 12// 13//===----------------------------------------------------------------------===// 14 15#define DEBUG_TYPE "jit" 16#include "Interpreter/Interpreter.h" 17#include "JIT/JIT.h" 18#include "llvm/Constants.h" 19#include "llvm/DerivedTypes.h" 20#include "llvm/Module.h" 21#include "llvm/ModuleProvider.h" 22#include "llvm/ADT/Statistic.h" 23#include "llvm/CodeGen/IntrinsicLowering.h" 24#include "llvm/ExecutionEngine/ExecutionEngine.h" 25#include "llvm/ExecutionEngine/GenericValue.h" 26#include "llvm/Support/Debug.h" 27#include "llvm/System/DynamicLibrary.h" 28#include "llvm/Target/TargetData.h" 29using namespace llvm; 30 31namespace { 32 Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized"); 33 Statistic<> NumGlobals ("lli", "Number of global vars initialized"); 34} 35 36ExecutionEngine::ExecutionEngine(ModuleProvider *P) : 37 CurMod(*P->getModule()), MP(P) { 38 assert(P && "ModuleProvider is null?"); 39} 40 41ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) { 42 assert(M && "Module is null?"); 43} 44 45ExecutionEngine::~ExecutionEngine() { 46 delete MP; 47} 48 49/// getGlobalValueAtAddress - Return the LLVM global value object that starts 50/// at the specified address. 51/// 52const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) { 53 MutexGuard locked(lock); 54 55 // If we haven't computed the reverse mapping yet, do so first. 56 if (state.getGlobalAddressReverseMap(locked).empty()) { 57 for (std::map<const GlobalValue*, void *>::iterator I = 58 state.getGlobalAddressMap(locked).begin(), E = state.getGlobalAddressMap(locked).end(); I != E; ++I) 59 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second, I->first)); 60 } 61 62 std::map<void *, const GlobalValue*>::iterator I = 63 state.getGlobalAddressReverseMap(locked).find(Addr); 64 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0; 65} 66 67// CreateArgv - Turn a vector of strings into a nice argv style array of 68// pointers to null terminated strings. 69// 70static void *CreateArgv(ExecutionEngine *EE, 71 const std::vector<std::string> &InputArgv) { 72 unsigned PtrSize = EE->getTargetData().getPointerSize(); 73 char *Result = new char[(InputArgv.size()+1)*PtrSize]; 74 75 DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n"); 76 const Type *SBytePtr = PointerType::get(Type::SByteTy); 77 78 for (unsigned i = 0; i != InputArgv.size(); ++i) { 79 unsigned Size = InputArgv[i].size()+1; 80 char *Dest = new char[Size]; 81 DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n"); 82 83 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest); 84 Dest[Size-1] = 0; 85 86 // Endian safe: Result[i] = (PointerTy)Dest; 87 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize), 88 SBytePtr); 89 } 90 91 // Null terminate it 92 EE->StoreValueToMemory(PTOGV(0), 93 (GenericValue*)(Result+InputArgv.size()*PtrSize), 94 SBytePtr); 95 return Result; 96} 97 98/// runFunctionAsMain - This is a helper function which wraps runFunction to 99/// handle the common task of starting up main with the specified argc, argv, 100/// and envp parameters. 101int ExecutionEngine::runFunctionAsMain(Function *Fn, 102 const std::vector<std::string> &argv, 103 const char * const * envp) { 104 std::vector<GenericValue> GVArgs; 105 GenericValue GVArgc; 106 GVArgc.IntVal = argv.size(); 107 unsigned NumArgs = Fn->getFunctionType()->getNumParams(); 108 if (NumArgs) { 109 GVArgs.push_back(GVArgc); // Arg #0 = argc. 110 if (NumArgs > 1) { 111 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv. 112 assert(((char **)GVTOP(GVArgs[1]))[0] && 113 "argv[0] was null after CreateArgv"); 114 if (NumArgs > 2) { 115 std::vector<std::string> EnvVars; 116 for (unsigned i = 0; envp[i]; ++i) 117 EnvVars.push_back(envp[i]); 118 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp. 119 } 120 } 121 } 122 return runFunction(Fn, GVArgs).IntVal; 123} 124 125 126 127/// If possible, create a JIT, unless the caller specifically requests an 128/// Interpreter or there's an error. If even an Interpreter cannot be created, 129/// NULL is returned. 130/// 131ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP, 132 bool ForceInterpreter, 133 IntrinsicLowering *IL) { 134 ExecutionEngine *EE = 0; 135 136 // Unless the interpreter was explicitly selected, try making a JIT. 137 if (!ForceInterpreter) 138 EE = JIT::create(MP, IL); 139 140 // If we can't make a JIT, make an interpreter instead. 141 if (EE == 0) { 142 try { 143 Module *M = MP->materializeModule(); 144 try { 145 EE = Interpreter::create(M, IL); 146 } catch (...) { 147 std::cerr << "Error creating the interpreter!\n"; 148 } 149 } catch (std::string& errmsg) { 150 std::cerr << "Error reading the bytecode file: " << errmsg << "\n"; 151 } catch (...) { 152 std::cerr << "Error reading the bytecode file!\n"; 153 } 154 } 155 156 if (EE == 0) 157 delete IL; 158 else 159 // Make sure we can resolve symbols in the program as well. The zero arg 160 // to the function tells DynamicLibrary to load the program, not a library. 161 sys::DynamicLibrary::LoadLibraryPermanently(0); 162 163 return EE; 164} 165 166/// getPointerToGlobal - This returns the address of the specified global 167/// value. This may involve code generation if it's a function. 168/// 169void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) { 170 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV))) 171 return getPointerToFunction(F); 172 173 MutexGuard locked(lock); 174 assert(state.getGlobalAddressMap(locked)[GV] && "Global hasn't had an address allocated yet?"); 175 return state.getGlobalAddressMap(locked)[GV]; 176} 177 178/// FIXME: document 179/// 180GenericValue ExecutionEngine::getConstantValue(const Constant *C) { 181 GenericValue Result; 182 if (isa<UndefValue>(C)) return Result; 183 184 if (ConstantExpr *CE = const_cast<ConstantExpr*>(dyn_cast<ConstantExpr>(C))) { 185 switch (CE->getOpcode()) { 186 case Instruction::GetElementPtr: { 187 Result = getConstantValue(CE->getOperand(0)); 188 std::vector<Value*> Indexes(CE->op_begin()+1, CE->op_end()); 189 uint64_t Offset = 190 TD->getIndexedOffset(CE->getOperand(0)->getType(), Indexes); 191 192 if (getTargetData().getPointerSize() == 4) 193 Result.IntVal += Offset; 194 else 195 Result.LongVal += Offset; 196 return Result; 197 } 198 case Instruction::Cast: { 199 // We only need to handle a few cases here. Almost all casts will 200 // automatically fold, just the ones involving pointers won't. 201 // 202 Constant *Op = CE->getOperand(0); 203 GenericValue GV = getConstantValue(Op); 204 205 // Handle cast of pointer to pointer... 206 if (Op->getType()->getTypeID() == C->getType()->getTypeID()) 207 return GV; 208 209 // Handle a cast of pointer to any integral type... 210 if (isa<PointerType>(Op->getType()) && C->getType()->isIntegral()) 211 return GV; 212 213 // Handle cast of integer to a pointer... 214 if (isa<PointerType>(C->getType()) && Op->getType()->isIntegral()) 215 switch (Op->getType()->getTypeID()) { 216 case Type::BoolTyID: return PTOGV((void*)(uintptr_t)GV.BoolVal); 217 case Type::SByteTyID: return PTOGV((void*)( intptr_t)GV.SByteVal); 218 case Type::UByteTyID: return PTOGV((void*)(uintptr_t)GV.UByteVal); 219 case Type::ShortTyID: return PTOGV((void*)( intptr_t)GV.ShortVal); 220 case Type::UShortTyID: return PTOGV((void*)(uintptr_t)GV.UShortVal); 221 case Type::IntTyID: return PTOGV((void*)( intptr_t)GV.IntVal); 222 case Type::UIntTyID: return PTOGV((void*)(uintptr_t)GV.UIntVal); 223 case Type::LongTyID: return PTOGV((void*)( intptr_t)GV.LongVal); 224 case Type::ULongTyID: return PTOGV((void*)(uintptr_t)GV.ULongVal); 225 default: assert(0 && "Unknown integral type!"); 226 } 227 break; 228 } 229 230 case Instruction::Add: 231 switch (CE->getOperand(0)->getType()->getTypeID()) { 232 default: assert(0 && "Bad add type!"); abort(); 233 case Type::LongTyID: 234 case Type::ULongTyID: 235 Result.LongVal = getConstantValue(CE->getOperand(0)).LongVal + 236 getConstantValue(CE->getOperand(1)).LongVal; 237 break; 238 case Type::IntTyID: 239 case Type::UIntTyID: 240 Result.IntVal = getConstantValue(CE->getOperand(0)).IntVal + 241 getConstantValue(CE->getOperand(1)).IntVal; 242 break; 243 case Type::ShortTyID: 244 case Type::UShortTyID: 245 Result.ShortVal = getConstantValue(CE->getOperand(0)).ShortVal + 246 getConstantValue(CE->getOperand(1)).ShortVal; 247 break; 248 case Type::SByteTyID: 249 case Type::UByteTyID: 250 Result.SByteVal = getConstantValue(CE->getOperand(0)).SByteVal + 251 getConstantValue(CE->getOperand(1)).SByteVal; 252 break; 253 case Type::FloatTyID: 254 Result.FloatVal = getConstantValue(CE->getOperand(0)).FloatVal + 255 getConstantValue(CE->getOperand(1)).FloatVal; 256 break; 257 case Type::DoubleTyID: 258 Result.DoubleVal = getConstantValue(CE->getOperand(0)).DoubleVal + 259 getConstantValue(CE->getOperand(1)).DoubleVal; 260 break; 261 } 262 return Result; 263 default: 264 break; 265 } 266 std::cerr << "ConstantExpr not handled as global var init: " << *CE << "\n"; 267 abort(); 268 } 269 270 switch (C->getType()->getTypeID()) { 271#define GET_CONST_VAL(TY, CTY, CLASS) \ 272 case Type::TY##TyID: Result.TY##Val = (CTY)cast<CLASS>(C)->getValue(); break 273 GET_CONST_VAL(Bool , bool , ConstantBool); 274 GET_CONST_VAL(UByte , unsigned char , ConstantUInt); 275 GET_CONST_VAL(SByte , signed char , ConstantSInt); 276 GET_CONST_VAL(UShort , unsigned short, ConstantUInt); 277 GET_CONST_VAL(Short , signed short , ConstantSInt); 278 GET_CONST_VAL(UInt , unsigned int , ConstantUInt); 279 GET_CONST_VAL(Int , signed int , ConstantSInt); 280 GET_CONST_VAL(ULong , uint64_t , ConstantUInt); 281 GET_CONST_VAL(Long , int64_t , ConstantSInt); 282 GET_CONST_VAL(Float , float , ConstantFP); 283 GET_CONST_VAL(Double , double , ConstantFP); 284#undef GET_CONST_VAL 285 case Type::PointerTyID: 286 if (isa<ConstantPointerNull>(C)) 287 Result.PointerVal = 0; 288 else if (const Function *F = dyn_cast<Function>(C)) 289 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F))); 290 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C)) 291 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV))); 292 else 293 assert(0 && "Unknown constant pointer type!"); 294 break; 295 default: 296 std::cout << "ERROR: Constant unimp for type: " << *C->getType() << "\n"; 297 abort(); 298 } 299 return Result; 300} 301 302/// FIXME: document 303/// 304void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr, 305 const Type *Ty) { 306 if (getTargetData().isLittleEndian()) { 307 switch (Ty->getTypeID()) { 308 case Type::BoolTyID: 309 case Type::UByteTyID: 310 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break; 311 case Type::UShortTyID: 312 case Type::ShortTyID: Ptr->Untyped[0] = Val.UShortVal & 255; 313 Ptr->Untyped[1] = (Val.UShortVal >> 8) & 255; 314 break; 315 Store4BytesLittleEndian: 316 case Type::FloatTyID: 317 case Type::UIntTyID: 318 case Type::IntTyID: Ptr->Untyped[0] = Val.UIntVal & 255; 319 Ptr->Untyped[1] = (Val.UIntVal >> 8) & 255; 320 Ptr->Untyped[2] = (Val.UIntVal >> 16) & 255; 321 Ptr->Untyped[3] = (Val.UIntVal >> 24) & 255; 322 break; 323 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4) 324 goto Store4BytesLittleEndian; 325 case Type::DoubleTyID: 326 case Type::ULongTyID: 327 case Type::LongTyID: 328 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal ); 329 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 8); 330 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 16); 331 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 24); 332 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 32); 333 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 40); 334 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 48); 335 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal >> 56); 336 break; 337 default: 338 std::cout << "Cannot store value of type " << *Ty << "!\n"; 339 } 340 } else { 341 switch (Ty->getTypeID()) { 342 case Type::BoolTyID: 343 case Type::UByteTyID: 344 case Type::SByteTyID: Ptr->Untyped[0] = Val.UByteVal; break; 345 case Type::UShortTyID: 346 case Type::ShortTyID: Ptr->Untyped[1] = Val.UShortVal & 255; 347 Ptr->Untyped[0] = (Val.UShortVal >> 8) & 255; 348 break; 349 Store4BytesBigEndian: 350 case Type::FloatTyID: 351 case Type::UIntTyID: 352 case Type::IntTyID: Ptr->Untyped[3] = Val.UIntVal & 255; 353 Ptr->Untyped[2] = (Val.UIntVal >> 8) & 255; 354 Ptr->Untyped[1] = (Val.UIntVal >> 16) & 255; 355 Ptr->Untyped[0] = (Val.UIntVal >> 24) & 255; 356 break; 357 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4) 358 goto Store4BytesBigEndian; 359 case Type::DoubleTyID: 360 case Type::ULongTyID: 361 case Type::LongTyID: 362 Ptr->Untyped[7] = (unsigned char)(Val.ULongVal ); 363 Ptr->Untyped[6] = (unsigned char)(Val.ULongVal >> 8); 364 Ptr->Untyped[5] = (unsigned char)(Val.ULongVal >> 16); 365 Ptr->Untyped[4] = (unsigned char)(Val.ULongVal >> 24); 366 Ptr->Untyped[3] = (unsigned char)(Val.ULongVal >> 32); 367 Ptr->Untyped[2] = (unsigned char)(Val.ULongVal >> 40); 368 Ptr->Untyped[1] = (unsigned char)(Val.ULongVal >> 48); 369 Ptr->Untyped[0] = (unsigned char)(Val.ULongVal >> 56); 370 break; 371 default: 372 std::cout << "Cannot store value of type " << *Ty << "!\n"; 373 } 374 } 375} 376 377/// FIXME: document 378/// 379GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr, 380 const Type *Ty) { 381 GenericValue Result; 382 if (getTargetData().isLittleEndian()) { 383 switch (Ty->getTypeID()) { 384 case Type::BoolTyID: 385 case Type::UByteTyID: 386 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break; 387 case Type::UShortTyID: 388 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] | 389 ((unsigned)Ptr->Untyped[1] << 8); 390 break; 391 Load4BytesLittleEndian: 392 case Type::FloatTyID: 393 case Type::UIntTyID: 394 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] | 395 ((unsigned)Ptr->Untyped[1] << 8) | 396 ((unsigned)Ptr->Untyped[2] << 16) | 397 ((unsigned)Ptr->Untyped[3] << 24); 398 break; 399 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4) 400 goto Load4BytesLittleEndian; 401 case Type::DoubleTyID: 402 case Type::ULongTyID: 403 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] | 404 ((uint64_t)Ptr->Untyped[1] << 8) | 405 ((uint64_t)Ptr->Untyped[2] << 16) | 406 ((uint64_t)Ptr->Untyped[3] << 24) | 407 ((uint64_t)Ptr->Untyped[4] << 32) | 408 ((uint64_t)Ptr->Untyped[5] << 40) | 409 ((uint64_t)Ptr->Untyped[6] << 48) | 410 ((uint64_t)Ptr->Untyped[7] << 56); 411 break; 412 default: 413 std::cout << "Cannot load value of type " << *Ty << "!\n"; 414 abort(); 415 } 416 } else { 417 switch (Ty->getTypeID()) { 418 case Type::BoolTyID: 419 case Type::UByteTyID: 420 case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break; 421 case Type::UShortTyID: 422 case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] | 423 ((unsigned)Ptr->Untyped[0] << 8); 424 break; 425 Load4BytesBigEndian: 426 case Type::FloatTyID: 427 case Type::UIntTyID: 428 case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] | 429 ((unsigned)Ptr->Untyped[2] << 8) | 430 ((unsigned)Ptr->Untyped[1] << 16) | 431 ((unsigned)Ptr->Untyped[0] << 24); 432 break; 433 case Type::PointerTyID: if (getTargetData().getPointerSize() == 4) 434 goto Load4BytesBigEndian; 435 case Type::DoubleTyID: 436 case Type::ULongTyID: 437 case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] | 438 ((uint64_t)Ptr->Untyped[6] << 8) | 439 ((uint64_t)Ptr->Untyped[5] << 16) | 440 ((uint64_t)Ptr->Untyped[4] << 24) | 441 ((uint64_t)Ptr->Untyped[3] << 32) | 442 ((uint64_t)Ptr->Untyped[2] << 40) | 443 ((uint64_t)Ptr->Untyped[1] << 48) | 444 ((uint64_t)Ptr->Untyped[0] << 56); 445 break; 446 default: 447 std::cout << "Cannot load value of type " << *Ty << "!\n"; 448 abort(); 449 } 450 } 451 return Result; 452} 453 454// InitializeMemory - Recursive function to apply a Constant value into the 455// specified memory location... 456// 457void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) { 458 if (isa<UndefValue>(Init)) { 459 return; 460 } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(Init)) { 461 unsigned ElementSize = 462 getTargetData().getTypeSize(CP->getType()->getElementType()); 463 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 464 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize); 465 return; 466 } else if (Init->getType()->isFirstClassType()) { 467 GenericValue Val = getConstantValue(Init); 468 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType()); 469 return; 470 } else if (isa<ConstantAggregateZero>(Init)) { 471 memset(Addr, 0, (size_t)getTargetData().getTypeSize(Init->getType())); 472 return; 473 } 474 475 switch (Init->getType()->getTypeID()) { 476 case Type::ArrayTyID: { 477 const ConstantArray *CPA = cast<ConstantArray>(Init); 478 unsigned ElementSize = 479 getTargetData().getTypeSize(CPA->getType()->getElementType()); 480 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 481 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize); 482 return; 483 } 484 485 case Type::StructTyID: { 486 const ConstantStruct *CPS = cast<ConstantStruct>(Init); 487 const StructLayout *SL = 488 getTargetData().getStructLayout(cast<StructType>(CPS->getType())); 489 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 490 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->MemberOffsets[i]); 491 return; 492 } 493 494 default: 495 std::cerr << "Bad Type: " << *Init->getType() << "\n"; 496 assert(0 && "Unknown constant type to initialize memory with!"); 497 } 498} 499 500/// EmitGlobals - Emit all of the global variables to memory, storing their 501/// addresses into GlobalAddress. This must make sure to copy the contents of 502/// their initializers into the memory. 503/// 504void ExecutionEngine::emitGlobals() { 505 const TargetData &TD = getTargetData(); 506 507 // Loop over all of the global variables in the program, allocating the memory 508 // to hold them. 509 Module &M = getModule(); 510 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 511 I != E; ++I) 512 if (!I->isExternal()) { 513 // Get the type of the global... 514 const Type *Ty = I->getType()->getElementType(); 515 516 // Allocate some memory for it! 517 unsigned Size = TD.getTypeSize(Ty); 518 addGlobalMapping(I, new char[Size]); 519 } else { 520 // External variable reference. Try to use the dynamic loader to 521 // get a pointer to it. 522 if (void *SymAddr = sys::DynamicLibrary::SearchForAddressOfSymbol( 523 I->getName().c_str())) 524 addGlobalMapping(I, SymAddr); 525 else { 526 std::cerr << "Could not resolve external global address: " 527 << I->getName() << "\n"; 528 abort(); 529 } 530 } 531 532 // Now that all of the globals are set up in memory, loop through them all and 533 // initialize their contents. 534 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 535 I != E; ++I) 536 if (!I->isExternal()) 537 EmitGlobalVariable(I); 538} 539 540// EmitGlobalVariable - This method emits the specified global variable to the 541// address specified in GlobalAddresses, or allocates new memory if it's not 542// already in the map. 543void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) { 544 void *GA = getPointerToGlobalIfAvailable(GV); 545 DEBUG(std::cerr << "Global '" << GV->getName() << "' -> " << GA << "\n"); 546 547 const Type *ElTy = GV->getType()->getElementType(); 548 size_t GVSize = (size_t)getTargetData().getTypeSize(ElTy); 549 if (GA == 0) { 550 // If it's not already specified, allocate memory for the global. 551 GA = new char[GVSize]; 552 addGlobalMapping(GV, GA); 553 } 554 555 InitializeMemory(GV->getInitializer(), GA); 556 NumInitBytes += (unsigned)GVSize; 557 ++NumGlobals; 558} 559